Scaffold



G. J. LUX AND J. WILCOX.

SCAFFOLD.

APPLICATION FILED JULY 2.1918.

. Patented Nov. 1,1921;

2 SHEETS-SHEET I.

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6.1.- LU X AND J. WILCOX.

SCAFFOLD.

APPLICATION FILED JULY 2. ms.

SSHEET 2.

Patented'Nov. 1, 1921.

UNITED STATES PATENT OFFICE.

SCAFFOLD.

Application filed July 2, 1918.

To all whom it may concern:

Be it known that we, GEORGE J. LUX and JOHN WILoox, citizens of the United States, residing at Independence, in the county of Montgomery and State of Kansas, have invented certain new and useful Improvements in a Scaffold, of which the following is a specification.

This invention has relation to scaffolds, and has for an object to provide an apparatus including uprights and members adapted to travel thereon to support a platform, and means operable by a person standing on the platform to raise the members and consequently the platform.

Another object of the invention is to pro vide a safety meanson the traveling members adapted to grip the uprights whereby to obviate at all times the possibility of accidental descent of the platform.

In addition to the foregoing, our invention resides in the details of construction and novel arrangement of parts as will be hereinafter described, and particularly pointed out in the appended claims.

In the accompanying drawings in which the same characters of reference refer to the like and corresponding parts throughout the several views in which they appear:

Figure 1 is a view in front elevation of a scaffold constructed in accordance with our invention.

Fig. 2 is a view in side elevation on an enlarged scale of one of the platform supporting members.

Fig. 3 is a transverse section taken on the line 33 of Fig. 2.

Fig. 4 is an elevation showing the inner side of a plate engaged by a portion of an upright.

Fig. 5 is a detail section taken through one of the upright engaging dogs.

Fig. 6 is a detail view in elevation of the joint between the ends of upright sections; and

Fig. 7 is a view in longitudinal'section of the parts shown in the preceding figure.

With reference to the drawings, 10 indicates generally a pair of uprights, in the form of strips 10, each of which is formed in sections of standard lengths. One end'of each section or strip is formed with a substantially V-shaped cut as indicated at 11 to receive the correspondingly beveled end 12 of the next section.- Thus each section is Specification of Letters Patent.

Patented Nov. 1, 1921.

Serial No. 243,016.

provided upon one end with acut out portion, and its other end is beveled. Each end of each section is furthermore formed with a longitudinally extending slot 13, which slots are preferably enlarged at their inner ends as indicated at 14, to receive a tie bar 15 which snugly fits the slots and thereby forms a rigid connection between the ends of mating sections. Each section or strip, which may be formed of wood or metal, is reinforcedby applying strips 16 and 17 of a width less than the width of the strips 10, to each side of said strips 10, the strips 16 extending throughout the length of a section, falling short of the ends thereof, however, as indicated. The other strip 17 falls short of one end of the section 10 but extends beyond the other end thereof as indicated at 18 to overlap the joint between adjacent sections. Screws 19 are adapted to enter-openings in the tie bar and strip 17 to secure the tie bar against displacement.

Each section 10 of the uprights is formed upon opposite edges with notches 20, the notches of opposite edges being arranged in relatively staggered relation as indicated. The uprights are designed to support travelers indicated generally at 21, dulplicates in construction and comprising rectangular plates 22 disposed at opposite sides of the uprights, the plates of'eachmember being connected together through the medium of bolts 23. To insure regular movement of the members up and down the uprights and to retain their relation thereto, cleats 24: are secured to the inner surfaces of the plates to en age the notched edges of the uprights. epending from pins 24' which project from the outer surfaces of the plates 22 at the upper ends thereofare rods 25; two rods being provided for each traveler, and at opposite sides of the uprights. A. cross bar 26 is secured at a point intermediate its ends to each rod 25 and extended at right angles thereto, or me normally horizontal position. Similar cross bars 27 are secured to the rods 25 in a similar manner and beneath the bars 26, the bars 26 and 27 being then connected at their ends by means of brace bars 28. It will thus be apparent that a pair of such structures comprised by the bars 26, 27, and 28 is carried by each traveler, and is adapted to be moved up and down the uprights therewith.

An operating leveris provided for each oscillated in a vertical plane.

traveler comprising spaced bars adapted to engage the outer surfaces of the plates 22, the terminals of the bars being brought together and secured to each other and to handles 30. The bars 29 are fulcrumed at a point intermediate their ends upon the pins 24' as indicated whereby the lever may be Each lever supports a pair of elevating dogs 31 which are pivotally mounted between the bars 29 of the lever and upon bolts 32 connecting said. bars, so as to engage simultaneously the notched edges of the uprights. Each of said bolts 32 in each lever is furthermore designed to pivotally support a safety dog 33 which is preferably elongated and extends from the top edges of the plates to a point beneath the lower edges thereof. The upper ends of the safety dogs may depend from the bolts 32. The bifurcated portions of the safety dogs are furthermore connected by means of pivot bolts 34: which are formed with. transverse openings 34;. Adjusting screws 35 pass through the openings of the said bolts 34. and one end of each screw is swiveled to the adjacent elevating dog 31, a nut 36 being applied to the opposite threaded end of the screw to bear against a washer 36 interposed between the nut and the aforesaid bolt 34. A coiled spring 37 is then embraced about that portion of the screw 35 between the dog 31 and the bolt 3 1 to urgesaid dogtoward engagement with the notched edge of the upright. The lower ends of the safety dogs are enlarged as indicated at 38 and shaped to seat in the notches of the upright, the dogs being held in such engagement with the uprights at all times throughvthe medium of springs 39 which connect said enlargements.

A platform 40 maybe supported jointly by the cross bars 26 as illustrated in Fig. 1, and by oscillating the levers simultaneously, the elevating dogs maybe caused to alter nately engage in one notch after another 7 thereby gradually raising the travelers and consequently the platform. The platform may be raised while occupied by the operators by the levers if desired. The uprights may be anchored to'the wall of abuilding, and as the platform is raised, additional sections may be added to the uprights and the elevating of the platform thus continued until the desired height is reached.

It will be apparent that the elevating and safety dogs may be released from engagement with the uprights by grasping and pulling them outwardly. A function of the safety dogs 33 is to remain in constant engagement with the uprights thereby supporting the travelers in the event that the elevating dogs 31 break or are accidentally displaced. v

While we have illustrated and described our invention in detail, we realize that in practice alterations therein may be made; and we therefore reserve the right and privilege of changingthe form of the details of construction or altering the relation of the parts without departing from the spirit of the invention, or the scope of the ap pended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is 1. A scaffold comprising a plurality of uprights, each having a vertical series of.

notches arranged in staggered relation, travelers mounted on the uprights, means carried by the travelers for supporting a platform therebetween, a lever oscillatably mounted on each traveler, elevating dogs carried by each lever for engaging the uprights to cause vertical movement of the traveler when the levers are oscillated, safety dogs carried by the levers for constant engagement with the uprights, and resilient means for retaining the safety dogs in such engagement.

2. A scafiold comprising a plurality of uprights, each having a vertical series of notches arranged in staggered relation, travelers mounted on the uprights, means carried by the travelers for supporting a platform therebetween, a lever oscillatably mounted on each traveler, elevating dogs carried by each lever for engaging the uprights to cause vertical movement of the. travelers when the levers are oscillated, safety dogs carried by the levers, resilient means connecting the safety dogs to retain the same in engagement with the uprights, and resilient means carried by the safety dogs for retaining the elevating dogs in engagement with the uprights.

3. A. scaffold comprising a plurality of uprights, each having a vertical series of notches arranged in staggered relation, travelers mounted on the uprights, means carried by the travelers for supporting a platform therebetween, a lever oscillatably mounted on each traveler, elevating dogs carried by each lever forengaging the up rights to cause vertical movement of the travelers when the levers are oscillated, safety dogs carried by the levers, springs connecting said safety dogs to retain the same in engagement with the uprights, and

-' adjusting means carried by each safety dog and engaging the elevating dogs, said means retaining the elevating dogs in engagement with the uprights.

41. A scaffold including a plurality of uprights, each formed in sections detachably connected together, a vertical series of notches along the-longitudinal edges of the uprights, travelers slidably mounted on theuprights, means associated with the travelers for supporting a platform therebetween, a lever oscillatably mounted on each traveler, elevating dogs carried by each lever In testimony whereof, We have affixed our for engaging the notches of the uprightslto signatures in the presence of two Witnesses. 10 cause vertical movement 0 the trave er when the levers are oscillated, safety dogs carried by the levers for constant engagement with the uprights, and resilient means Witnesses:

for normally holding said dogs in mesh A. L. BILLINGS,

With said notches. LEWIS I. EDWARDS. 

